Design of adaptive detection system of projected-capacitive touch-screen

TONG Hua-liang; LIN Zhi-xian; GUO Tai-liang

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Design of adaptive detection system of projected-capacitive touch-screen

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- Design of adaptive detection system of projected-capacitive touch-screen
- Chinese Journal of Liquid Crystals and Displays Vol. 29, Issue 1, Pages: 77-82(2014)
- 作者机构：
  
  福州大学物理与信息工程学院,福建福州,350002
- 作者简介：
- 基金信息：
- DOI：
  CLC： TN27;TN873
- Received：19 July 2013，
  
  Revised：11 August 2013，
  
  Published：15 February 2014
- 稿件说明：
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童华梁, 林志贤, 郭太良. 投射电容式触摸屏自适应检测系统的设计[J]. 液晶与显示, 2014,29(1): 77-82

TONG Hua-liang, LIN Zhi-xian, GUO Tai-liang. Design of adaptive detection system of projected-capacitive touch-screen[J]. , 2014,29(1): 77-82
童华梁, 林志贤, 郭太良. 投射电容式触摸屏自适应检测系统的设计[J]. 液晶与显示, 2014,29(1): 77-82 DOI：

TONG Hua-liang, LIN Zhi-xian, GUO Tai-liang. Design of adaptive detection system of projected-capacitive touch-screen[J]. , 2014,29(1): 77-82 DOI：

摘要

为了减少投射电容式触摸屏互电容的检测数量，提出了一种自适应检测算法，并对该算法进行分析和验证。将整个投射电容式触摸屏抽象成一个网格，互电容为网格横纵的交错点。分析网格横纵2个方向变阈值的自适应扫描，并将其与逐行扫描法进行对比。设计出以FPGA为控制核心、外加检测电路的自适应检测系统对该算法进行验证。实验结果表明，对电极间距为1 mm，驱动区为7154的投射电容式触摸屏，在识别点数分别为3、2、1时，与采用传统的逐行扫描法相比，采用自适应检测法需要的检测次数分别相应地减少为1/5.0、1/6.5、1/10.4，有效地缩短了触摸信息的检测时间，对投射电容式触摸屏在大尺寸方向的发展与应用有积极意义。

Abstract

In order to reduce the detection times of the mutual capacitance of projected-capacitive touch-screen

an adaptive detection algorithm is proposed

parsed and validated. First of all

the entire projected-capacitive touch-screen is abstracted into a grid

and each crossing point of the grid represents a mutual capacitance.Then an adaptive scanning method based on variable threshold in both directions is analyzed and contrasted with the progressive scanning method. Finally

an adaptive detection system is designed

which includes a FPGA as the center control unit and other detection circuit to verify the algorithm. Experimental results show that compared with traditional progressive scan method

the detection number of adaptive detection method needs correspondingly reduce for 1/5.0

1/6.5

1/10.4 respectively under the conditions that the identification points is from 3 to 1 and the projected-capacitive touch-screen which electrode spacing is 1 mm and the driving area is 7154.The detection time of touch information is effectively shorten

which is meaningful for projected-capacitive touch-screen's development in the direction of large-size application.

关键词

Keywords

references

Wikipedia.Touchscreen.[EB/OL].http://en.wikipedia.org/wiki/Touchscreen.[2] 张雪峰. 触摸屏技术浅谈[J]. 现代物理知识, 2008, 16(3):43-45. ZHANG X F. Touch screen technology[J]. Modern Physics, 2008, 16(3):43-45. (in Chinese)[3] Chitiz Mathema.Multi-Touch All-Point Touchscreens:The Future of User Interface Design.[EB/OL].http://china.cypress.com/rID=37962.[4] 周自立.电容式触摸屏的多点解决方案[D].广州:华南理工大学, 2012. ZHOU Z L.Multi-touch solutions of capacitive touch panel.Guangzhou: Graduate University of South China University of Technalagy, 2012.(in Chinese)[5] 李兵兵, 黄子强. 电容式多点触摸屏的器件设计及算法实现[J]. 液晶与显示, 2011, 26(2):216-219. LI B B, HUANG Z Q. Device design and algorithm implementation of capacitive multi-touch screen[J]. Chinese Journal of Liquid Crystals and Displays, 2011, 26(2):216-219. (in Chinese)[6] 朱维安, 郑寿云, 陈莉. 电容触摸屏的坐标定位分析[J]. 电子测量技术, 2009, 32(5):13-16. ZHU W A, ZHENG S Y, CHEN L. Analysis on coordinate positioning of capacitive touch panel[J]. Electronic Measurement Technology, 2009, 32(5):13-16. (in Chinese)[7] 翁小平. 触摸感应及其应用基于CapSense[M].北京:北京航空航天大学出版社, 2010:175-177. WENG X P. Touch Sensing and its Application-Based CapSense[M] Beijing: Beihang University Press, 2010:175-177. (in Chinese)[8] 沈奕, 吕岳敏. 用于投射式电容触摸屏中的爬山搜索算法研究[J]. 液晶与显示, 2013, 28(1):82-86. SHEN Y, LV Y M. Mountain-climb searching algorithm used in projected capacity touch-screen[J]. Chinese Journal of Liquid Crystals and Displays, 2013, 28 (1):82-86. (in Chinese)[9] ZHAN S W, WEI T C, LI B, et al.A touch sensor controller IC adopting differential measurement for projected capacitive touch panel systems[C]//Proc. 2012 IEEE 12th International Conference on Computer and Information Technology.Chengdu: IEEE Press, 2012:477-481.[10] RUAN J Y, CHAO C P, CHEN W D.A multi-touch interface circuit for a large-sized capacitive touch panel[C]//Proc.IEEE SENSORS 2010 Conference, Kona, HI:IEEE Press, 2010:309-314.

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